The most common source of infectious diseases in water supplies is
a. algal blooms
b. sewage
c. surface runoff
d. none of the above
which of the following is not a reason that nonnative species are reared outside their native ecosystems?
a. they are commercially important.
b. they are used to replace native species.
c. they are used for restocking programs.
d. none of the above

Ava has an important exam coming up for which she feels unprepared. what is the best way for ava to relieve her stress about the exam? question 17 options: indulge in a little more coffee than usual to increase her concentration on the day of the exam. limit her time spent thinking about the exam and focus on leisure activities. spend extra time relaxing, sleeping, and watching television in the days leading up to the exam. manage her time by setting up a study schedule for the week prior to the exam.